The Spindle, 6.4” or 162.56mm long with 4mm x 4mm x 20mm long key way. It adds about 1.9" extra in width.
The over all length is now 6.4" (top picture), the old one was 6" long (old). We added .40" in length.
The key way has been moved .30" over to the center or adding .30" length to the right / pedal side.
The extra length is needed to accommodate the range of freewheels and how they are made, and how the pedal arms fit inside the ID of the freewheel.
This length will work for both 68 MM and 73 MM with room to spare due to the difference in using the crank arms that we sell or a wide range of the ones on most bicycle.
We added a extra bearing on the Crank Assembly and made the flange a little wider so the can be installed or removed easier.
The Spindle is made out of 17mm OD Ground and Polished 4140 HT, Oil Quenched & Tempered. 4140 Chromolly Steel has a standard, industry recognized Rockwell C Hardness rating of 28 - 32.
Our spindle will have the Traditional Square Tapered and per drilled and tapped with 8mm x 1.0 threads.
See picture showing the square taper.
